The Collaborative International Dictionary of English v.0.48:

Vender \Vend"er\, n. [From Vend: cf. F. vendeur, OF. vendeor.
   Cf. Vendor.]
   One who vends; one who transfers the exclusive right of
   possessing a thing, either his own, or that of another as his
   agent, for a price or pecuniary equivalent; a seller; a
   vendor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vender
    n 1: someone who promotes or exchanges goods or services for
         money [syn: seller, marketer, vender, vendor,
         trafficker]